(US4940338-A)      Mobile device turns over or mixes accumulations of organic waste materials maturing to compost at fixed dump sites. Device hs a steerable chassis with working tracks enabling it to advance through the accumulator, having a mechanism for mixing the waste picked up while driving through, and redepositing waste behind the device.after thorough mixing.    Device comprises a clearing mechanism in the front side of the chassis and in the area in front of each working track of the chassis for clearing a track path upon moving through the waste. Clearing mechanism has a mixing mechanism, a guide shield in front of its intake, and working clearing tools on a guide surface within the mixing mechanism. Clearing tools comprise a disk contained by a drive element to rotate disks in front of the guide surface, with excavating projections upon the disks. Each disk projection comprises a stop extending radially from the disk and projecting out of the disk plane. Drive element is coupled with a hydraulic motor. Guide surface has a scraper strip on its lower edge.    ADVANTAGE -   Recontamination from wastes left behind the device is prevented. @(7pp)@    (EP346642-B1)      A mobile machine for shifting and overturning piles of organic waste maturing on stationary storage sites to form compost, with a steerable chassis for advancing the machine through a pile, an excavating device arranged on the machine front side in the region in front of each running track of the chassis, and with a device for mixing the waste which is collected as the machine travels through the waste and is deposited again in a mixed stage behind the machine, characterised in that each excavating device (5, 5') comprises a guide plate (6, 6'), whose guide surface (7, 7') is provided with actively operating excavating tools (8, 8'), and each excavating device (5, 5') is articulated to tilt about a vertical axis (9, 9') in the region of an outer corner (10, 10').    (JP2895092-B2)      A mobile unit which on passage through thick layers of organic material rotting to form compost takes in material to be aerated, mixed and finally ejected from the unit rear to continue the rotting, automatically clears a lane for its advance by transfer means at the front end of the unit. A plate at the front end carries tools driven by a hydraulic motor, and can be vertically moved into and out of engagement with the compost surface. A scraper strip of the underside of each guide surface is made of rubber.    ADVANTAGE -   Avoids need to make special approach lanes.